I already tried uninstalling and re-installing the AFAIK necessary components (screenshot 1, screenshot 2) (before, I had Java 6 AND 7 installed. I already tried leaving only Java 7, and now I am back to leaving only Java 6), but I cannot get it to work.

UPDATE: I had so much trouble with Java in Firefox quitting working after upgrades, etc. that I gave up on Firefox entirely (my main purpose of using this Ubuntu machine is to safely run Java applications away from my main computer). I now run Opera and never had any problems again - it comes with Java, and it just works.

Are you certain that no applets work? I can't get the verification applet to run but I can get other applets to work, such as the ShapeMover example in the Java Tutorial.
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iBelieveNov 29 '12 at 16:01

All I ran was sudo apt-get install icedtea-plugin and all applets that I've tried have worked except the verification applet you mentioned.
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iBelieveNov 29 '12 at 16:05

I don't know if it makes a difference, but I'm running Ubuntu 12.10.
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iBelieveNov 29 '12 at 16:11

Spencer, I dont know when it started working, but the applet I needed to run is working, eventhough the test applet does not. Since I was checking to see if it was working using the damn test applet, I was still under the impression it wasn't working. It must have gotten fixed during my uninstall-reinstall ordeal. Thank you. Feel free to submit an answer.
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GaiaNov 29 '12 at 21:21

2 Answers
2

It appears that the Java verification applet doesn't work with the implementation of Java that Ubuntu uses (OpenJDK), but other applets should work if you install the Java web plugin, which is a plugin that lets Java applets run in a web browser.

I already had it, but naturally you weren't aware of that because I was editing the answer to include info on what I already had installed (which took me a while, because I cannot post images/more than 2 hyperlinks/etc). I wish SE checked your network reputation and instantly gave old members with more than X points on a network site 10, instead of 1 point, to start. But that's a suggestion for Meta.
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GaiaNov 29 '12 at 13:36